> This might be pretty obvious (or I missed it in the code), but are you
> acknowleging the irq in your isr?
> i.e., does your isr look something like this in the beginning:
> ISR pha ; save registers
> tya
> pha
> txa
> pha
> sta INTACK ; clear irq counter
>
Well this is potentially embarssing... No I'm not-- is there a
dedicated location to clear? It makes sense- it sure looks like my ISR
is running because I'm getting a steady display. I guess it could just
be looping in the ISR forever and not making it back out to the "zoom"
part of the main code. Excellent advise... Danke!
(And MAME probably doesn't really "latch" the IRQ input, so that might
jive with it working OK there...)
-Clay
Received on Thu Apr 15 15:25:35 1999
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